Defense: Materials Growth And Characterization Of Thermoelectric And Resistive Switching Devices

Kate Norris
Graduate Student
Electrical Engineering
Engineering 2, Room 215
Nobuhiko Kobayashi


In this talk, two topics: (1) thermoelectrics power generation devices and (2) resistive electrical switching devices, will be separately covered within the frame work of material synthesis/characterization and device fabrication/evaluation at the nanometer scale.

(1) In the US, more than 50% of the consumed energy is wasted as heat. To recover the waste heat, thermoelectric power generators could be a viable solution if it was highly-scalable and cost-effective. My research has been addressing these two challenges by studying thermoelectric properties of semiconductor nanowire network integrated on mechanically flexible and highly-scalable substrates. Growth of semiconductor nanowires by chemical vapor deposition and testing of fabricated thermoelectric power generation devices will be discussed.

(2) Nonvolatile memory, logic circuits, and neuromorphic computing are problems essential to the progression of computing. As we continue to scale down and reach the limits of transistors we need new devices for memory and computing. My research has been focusing on this problem through Resistive Switching devices, two terminal electrical resistance switches that retain a state based on the history of applied voltage and current, composed of TaOx with various top electrode materials. Understanding how these specific devices operate using electron microscopy and spectroscopy will be discussed.